Electrodeionization EDI systems have become the solution to many applications, with lower operating expenses and fewer maintenance requirements making. Remove residual salts and other aqueous species from your water with up to 18 MOhm-cm resistivity. SUEZ’s E-Cell* electrodeionization (EDI) technology. Electrodeionization (EDI) is a water purification system that relies on electricity to remove ionic impurities from water into a concentrate water stream.

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Because they generally consist of ions in solution, electrolytes are also known as ionic solutions, but molten electrolytes and solid electrolytes are also possible.

Electrodeionization (EDI) | Water Purification Technology | ELGA LabWater

How does it work? Regenerable Mixed Bed Deionization No acid or caustic bulk storage, pumping, waste neutralization or disposal issues. It also enables you to see the benefits of EDI, understand how to design an EDI system and watchouts during design and operation to maintain your system. For more information, including technical papers, case studies, and product specs, explore the electrodeionization EDI resource page in the Document Library.


Strong ions are scavenged out of the feed stream by the mixed bed resins. The ion exchange systems are usually supplied in duplicate, to allow one system to provide water while the other one is being regenerated. May be registered in one or more countries. Its development and use in water purification overcame some of the limitations of ion exchange resin beds, particularly the release of ions as the beds exhaust. Ions in the separate chamber are flushed to waste.

The combination of ion-exchange resins and ion-exchange membranes, which are used to move ionic impurities into a waste or concentrate water stream leaving purified product water.

Sensitivity to hardness Most EDI devices have a 1 ppm hardness limit which is easily addressed with proper pretreatment system design.

The main applications of EDI technology, such as that supplied by Ionpure, E-cell and SnowPure, are in electronics, pharmaceuticals and power generation. Some of the advantages of the EDI as opposed to the conventional systems of ionic interchange are: Transport through resin bead particle diffusion can be limiting.


One important aspect sytem the water treatment application is that some types of EDI needs to have feed water that is free from CO2, as well as other dissolved gasses, since these put unnecessary strain on the EDI unit and will reduce performance. Water is passed between an anode positive electrode and a cathode negative electrode.

Electrodeionization (EDI)

elecfrodeionization New Technologies Conventional water treatment systems rely on chemically-regenerated ion exchange resins to remove dissolved solids. Eliminates the need for a second bank of RO membranes and associated plumbing, pumping and control equipment.

A single EDI unit may operate for many years before a replacement is required. Any ionic species formed from the carbon sydtem gas will lower the outlet resistivity of the water systm by EDI. EDI modules can be eystem to operate from a fraction of a gpm up to about 50 gpm.

By using elecrrodeionization site, you agree to the Terms of Use and Privacy Policy. An electrode in an electrochemical cell is referred to as either an anode or a cathodeterms that were coined by Michael Faraday. EDI has a significantly smaller footprint than conventional ion exchange processes.

The electric current supplied from various energy sources charges the ions that make up the contaminants. We’re here to help. This article relies too much on references to primary sources. The ion exchange beds in our EDI systems are regenerated continuously so that they do not exhaust in the same way as ion exchange beds that are operated in batch mode. RW-EDI is a process that targets the desalination of impaired water or water with salt levels of 1, – 10, ppm.

Only the ions can pass through the membrane, the water is blocked. These regenerated resins allow ionization of neutral or weakly-ionized aqueous species such as carbon dioxide or silica.

Electrodeionization – Wikipedia

Please improve this by adding secondary or tertiary electrodeionizarion. Second pass of RO Eliminates the need for a second bank of RO membranes and associated plumbing, pumping and control equipment.

Argonne National Laboratory estimates that RO systems do not require chemical regeneration and also remove many types of total organic carbon TOC which will pass through ion exchange resins. These ions are collected into concentrate streams which can then be put to drain or be recycled.


These act as continuous regenerating agents of the ion-exchange resin. The Elecrtodeionization process is a continuous process, utilizes no chemicals for regeneration, does not pollute the environment and requires a fraction of the operator attention necessary for conventional ion exchange systems.

Remove residual salts and other aqueous species from your water with up to 18 MOhm-cm resistivity.

Electrodeionization EDI is an electrically-driven water treatment technology that uses electricity, ion exchange and resin to remove ionized species from water. The management of CO 2 in water is typically handled in one or two ways: High purity water production has traditionally used a combination of membrane separation and ion exchange processes.

The anode is defined as the electrode at which electrons leave the cell and oxidation occurs, and the cathode as the electrode at which electrons enter the cell and reduction occurs. Electrodeionization is a water treatment technology that utilizes electricity, ion exchange membranes and resin to deionize water and separate dissolved ions impurities from water.

Removal Mechanisms While both ion exchange and EDI use ion exchange resins, the removal electroeeionization are quite different. It will also better prepare you for the content in the Intermediate EDI section. The waste regenerants from these systems are usually combined, neutralized and released to the environment.

A bipolar electrode is an electrode that functions as the anode of one cell and the cathode of another cell. An anode is setup on the left side of the setup and a cathode is setup on the right side of the setup. When fed with low TDS feed e. If you’d like to talk with a sales representative about purchasing SUEZ’s products and services, you can reach us here.